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Codeforces Round 964 (Div. 4)
11:04:49
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Difficulty:
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trees
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5703
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2013
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x471
1450G
Communism
bitmasks
,
dp
,
trees
3500
x305
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3538
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x135
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x568
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x219
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x625
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x968
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12592
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5988
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x311
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x138
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1998
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4326
1413F
Roads and Ramen
data structures
,
trees
2800
x764
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x1014
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1960
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10100
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7301
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x364
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x201
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9043
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2246
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5768
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x347
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x972
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1676
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x390
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6372
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9642
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x868
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1391
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2491
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x568
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10520
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x654
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x2150
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x424
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1892
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1461
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1579
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8545
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x590
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4301
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6753
1363C
Game On Leaves
games
,
trees
1600
x18428
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x671
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x312
1344E
Train Tracks
data structures
,
trees
3100
x456
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x984
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x996
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8388
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x203
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20067
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x991
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x9309
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x76
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13437
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x9720
1322F
Assigning Fares
dp
,
trees
3500
x94
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x804
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2328
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x576
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4941
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x5151
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x777
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x426
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x205
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2856
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5661
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x791
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2040
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4653
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1819
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7625
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x316
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1829
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x982
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2662
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1903
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3927
1276D
Tree Elimination
dp
,
trees
2900
x524
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x864
1260F
Colored Tree
data structures
,
trees
2700
x501
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x263
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1192
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1682
1252F
Regular Forestation
hashing
,
trees
2400
x909
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x334
1252B
Cleaning Robots
dp
,
trees
2300
x508
1249F
Maximum Weight Subset
dp
,
trees
2200
x2298
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x7342
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7478
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1850
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x422
1225F
Tree Factory
constructive algorithms
,
greedy
,
trees
2500
x876
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2559
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2719
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